WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE

WU Jiahuan; ZHANG Yueqi; ZHU Ming; YANG Guang; WANG Wenxiang; JIANG Hongxing; DUAN Pengfei; JIANG Peng; YUAN Haoran; CHEN Yong

doi:10.13205/j.hjgc.202303006

Volume 41 Issue 3

Mar. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(3): 42-48

WU Jiahuan, ZHANG Yueqi, ZHU Ming, YANG Guang, WANG Wenxiang, JIANG Hongxing, DUAN Pengfei, JIANG Peng, YUAN Haoran, CHEN Yong. WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 42-48. doi: 10.13205/j.hjgc.202303006

Citation:

WU Jiahuan, ZHANG Yueqi, ZHU Ming, YANG Guang, WANG Wenxiang, JIANG Hongxing, DUAN Pengfei, JIANG Peng, YUAN Haoran, CHEN Yong. WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 42-48. doi: 10.13205/j.hjgc.202303006

Citation:

WU Jiahuan, ZHANG Yueqi, ZHU Ming, YANG Guang, WANG Wenxiang, JIANG Hongxing, DUAN Pengfei, JIANG Peng, YUAN Haoran, CHEN Yong. WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 42-48. doi: 10.13205/j.hjgc.202303006

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WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE

doi: 10.13205/j.hjgc.202303006

1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. Shenzhen Gas Corporation Ltd, Shenzhen 518000, China;
3. China General Nuclear Power Corporation, Shenzhen 518028, China;
4. South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China;
5. State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, Guangzhou 510655, China;
6. Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 511458, China

Received Date: 2021-10-13
Available Online: 2023-05-26
Publish Date: 2023-03-01

Abstract

Abstract

Sludge dewatering is a prerequisite for sludge utilization. In this study, potassium ferrate (K₂FeO₄) and sludge biochar (sludge biochar obtained by pyrolysis of dehydrated sludge at 500 ℃, recorded as BC500) were used as conditioning agents for sludge pretreatment. After the sewage sludge was conditioned with 3.00 g/L K₂FeO₄ and 9.00 g/L BC500, the water content of the sludge cake was reduced to 42.33%, which was 36.47 percentage points lower than that in raw sludge cake. The existing forms of residual water in the sludge cake were detected by the low-field nuclear magnetic field. According to the strength of binding energy, residual water was divided into three types: bound water (0.23~10.72 ms) accounting for 99.68%~99.81%, capillary water (70.00~700.00 ms) accounting for 0.19%~0.32%, and free water. The binding energy of water molecules and organic matter was weakened due to oxidation of K₂FeO₄, and it also made the strongly bound water in the original sludge cake transform into weakly bound water, capillary water or free water; weakly bound water was transformed into capillary water or free water; capillary water was transformed into free water; and free water can be almost completely removed by mechanical dewatering. The imaging results showed that water content in sludge cake was linearly related to the brightness of images. In the production process, real-time online detection results can be used to guide the pressure adjustment of the dewatering process. This research can provide data support and theoretical basis for future deep sludge dewatering study.
- sewage sludge,
- dewaterability,
- low-field nuclear magnetic field,
- water distribution

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References(31)

References

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